A tower crane jib assembly

Abstract

The utility model relates to tower crane technical field discloses a kind of boom assembly of tower crane, including multiple boom main bodies distributed from left to right, connecting mechanism is arranged between the end of adjacent two boom main bodies, reinforcing mechanism is arranged between the outside of adjacent two boom main bodies;The utility model is realized mechanical clamping by the clamping plate and ratchet wheel cooperation sliding rod of reinforcing mechanism, rigid connection of adjacent boom main body can be quickly completed, effectively dispersed steering torsion without welding;Reinforcing mechanism uses reversible clamping structure, sliding plate is synchronously moved by rotating threaded rod driving, in combination with the ratchet wheel and pawl self-locking of anti-loosening mechanism, both welding process damage to boom structure is avoided, and tool-free quick disassembly and assembly can be realized, maintenance efficiency is significantly improved;Meanwhile, the contact surface of clamping plate and boom main body is dynamic adaptive clamping, can adapt to deformation compensation under different working conditions, further improves torsional stability and service life.

Description

Technical Field

[0001] This utility model relates to the field of tower crane technology, specifically a boom assembly for a tower crane. Background Technology

[0002] As a key piece of equipment in the construction and engineering field, the boom assembly of tower cranes is a core component that directly affects the crane's operating range, load-bearing capacity, and safety performance. When existing booms are in use, they are assembled structures. When the boom is rotating, there is rotational torque between the assembled booms. Over time, the assembly nodes of the assembled booms will loosen, resulting in a reduction in the service life of the boom.

[0003] Chinese patent discloses a boom structure based on a flat-top tower crane (authorization announcement number CN212222258U). This patented technology features fixed plates fixedly connected to the bottom of both the first and second booms. A force-reducing device is fixedly connected to the top of the fixed plates. A bottom support block is fixedly connected to the bottom of the inner cavity of the force-reducing device. A bottom clamping plate is fixedly connected to the top of the bottom support block. Tension springs are fixedly connected to both the front and back of the force-reducing device, and side clamping plates are fixedly connected to both the front and back of the force-reducing device. Through the setting of the fixed plates and the force-reducing device, the steering torque between the first and second booms can be reduced by the fixed plates and the tension springs in the force-reducing device during use. This ensures the fixed connection between the connecting block and the fixing bolt, avoids the problem of loosening of the assembly nodes of the assembled boom caused by long-term rotational operation, and ensures the service life of the boom. However, it has certain drawbacks: Firstly, the fixed plate is rigidly connected to the surface of the bottom chord of the boom by welding or bolts. Although it can provide some support, the welding process can cause thermal damage to the base material. Long-term use can easily lead to stress concentration and affect the structural strength. At the same time, the welding and bolt fixing methods make disassembly and maintenance extremely difficult, requiring cutting or damaging the original structure (frequent loosening and tightening of bolts causes wear). This not only increases maintenance costs but also shortens the overall service life of the boom. Secondly, the length of the fixing plate needs to be strictly matched with the boom, which means that precise positioning is required during installation and segmented adjustment is not possible, resulting in poor flexibility. If disassembly, maintenance or replacement of local components is required, the entire fixing plate must be removed, making the operation cumbersome. Utility Model Content

[0004] The purpose of this invention is to provide a boom assembly for a tower crane to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A boom assembly for a tower crane includes multiple boom bodies distributed from left to right. A connecting mechanism is provided between the ends of two adjacent boom bodies, and a reinforcing mechanism is provided between the exteriors of two adjacent boom bodies. The reinforcing mechanism includes a reinforcing plate. C-shaped plates are fixed to both ends of the side surface of the reinforcing plate near the boom body. Two sliding rods are symmetrically fixed to the front and rear surfaces of the inner side of the C-shaped plate. A threaded rod is rotatably connected to the rear surface of the C-shaped plate between the two sliding rods. Two sliding plates are threaded to the outer surface of the threaded rod on the inner side of the C-shaped plate. A clamping plate is fixed to the upper end of the sliding plate. A ratchet is fixed to the outer surface of the threaded rod in front of the C-shaped plate. An anti-loosening mechanism is provided on the front surface of the C-shaped plate above the threaded rod.

[0006] As a further embodiment of this utility model: the connecting mechanism includes a connecting block and a connecting sleeve movably located outside the connecting block. A pin is movably connected through the interior of the connecting block and the connecting sleeve. A bushing is movably connected to the exterior of the pin in front of the connecting sleeve. A C-shaped pin is movably connected through the interior of the bushing.

[0007] As a further embodiment of this utility model: the anti-loosening mechanism includes a spring, the upper end of which is fixedly connected to a mounting block, and the lower end of which is fixedly connected to a pawl, with a mounting rod rotatably connected to the end of the pawl away from the threaded rod.

[0008] As a further improvement of this utility model: the threaded rod movably passes through the front surface of the C-shaped plate, the sliding rod movably passes through the sliding plate, and the front and rear clamps respectively fit the front and rear sides of the boom body.

[0009] As a further embodiment of this utility model: the connecting block is fixed to the right end of the left boom body, the connecting sleeve is fixed to the left end of the right boom body, and the C-shaped pin moves through the front end of the pin shaft.

[0010] As a further embodiment of this utility model: the pawl is attached to the ratchet, and the mounting block and mounting rod are both fixed to the front surface of the C-shaped plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention achieves mechanical clamping through the clamping plate of the reinforcement mechanism, which works in conjunction with the ratchet, slide bar, and threaded rod. This allows for rapid rigid connection of adjacent boom bodies, effectively dispersing steering torque without welding. The reinforcement mechanism employs a reversible clamping structure, driving the slide bar to move synchronously via the rotating threaded rod. Combined with the ratchet and pawl self-locking mechanism of the anti-loosening mechanism, it avoids damage to the boom structure caused by welding and enables tool-free quick assembly and disassembly, significantly improving maintenance efficiency. Furthermore, the reinforcement mechanism can be installed independently on any section of the boom without requiring overall adaptation; Meanwhile, the contact surface between the clamping plate and the boom body is dynamically adaptable, which can adapt to deformation compensation under different working conditions, further improving torsional stability and service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the boom assembly of a tower crane; Figure 2 An exploded view of the connecting mechanism in the boom assembly of a tower crane; Figure 3 This is a schematic diagram of a reinforcement mechanism in the boom assembly of a tower crane; Figure 4 for Figure 3 Enlarged view of A in the middle; Figure 5 This is a schematic diagram of the actual use of a boom assembly of a tower crane.

[0013] In the diagram: 1. Boom body; 2. Connecting mechanism; 3. Connecting block; 4. Connecting sleeve; 5. Pin; 6. Bushing; 7. C-shaped pin; 8. Reinforcing mechanism; 9. Reinforcing plate; 10. C-shaped plate; 11. Slide rod; 12. Threaded rod; 13. Slide plate; 14. Clamping plate; 15. Ratchet; 16. Anti-loosening mechanism; 17. Spring; 18. Mounting block; 19. Pad; 20. Mounting rod; 21. Tower crane. Detailed Implementation

[0014] Please see Figure 1 , Figure 2 and Figure 5 In this embodiment of the present invention, a boom assembly of a tower crane includes multiple boom bodies 1 distributed from left to right. A connecting mechanism 2 is provided between the ends of two adjacent boom bodies 1. The connecting mechanism 2 includes a connecting block 3 and a connecting sleeve 4 movably located outside the connecting block 3. The connecting block 3 is fixed to the right end of the left boom body 1, and the connecting sleeve 4 is fixed to the left end of the right boom body 1. A pin 5 is movably connected through the interior of the connecting block 3 and the connecting sleeve 4. A bushing 6 is movably connected to the outside of the pin 5 in front of the connecting sleeve 4. A C-shaped pin 7 is movably connected through the interior of the bushing 6. The C-shaped pin 7 movably passes through the front end of the pin 5. Each boom body 1 includes three boom rods, which are parallel to each other and form a triangular frame. Adjacent boom rods are fixed together by multiple reinforcing rods. Each boom body 1 has a connecting sleeve 4 fixed to its left end and a connecting block 3 fixed to its right end; The C-shaped pin 7 fixes the pin 5 inside the connecting block 3 and the connecting sleeve 4, thereby connecting the connecting block 3 and the connecting sleeve 4 together; The initial state of the C-shaped pin 7 can be straight. After passing through the pin 5 and the bushing 6, both ends of it are heated and then bent into a C-shape using a tool. The boom assembly is mounted on the tower crane 21.

[0015] exist Figure 1 and Figure 3 In the middle: A reinforcement mechanism 8 is provided between the exterior of two adjacent boom bodies 1. The reinforcement mechanism 8 includes a reinforcement plate 9. C-shaped plates 10 are fixed to both ends of the side surface of the reinforcement plate 9 near the boom body 1. Two sliding rods 11 are symmetrically fixed to the front and rear surfaces of the C-shaped plate 10. A threaded rod 12 is rotatably connected to the rear surface of the C-shaped plate 10 between the two sliding rods 11. The threaded rod 12 moves through the front surface of the C-shaped plate 10. Two sliding plates 13 are threadedly connected to the outer surface of the threaded rod 12 on the inner side of the C-shaped plate 10. The sliding rod 11 moves through the sliding plate 13. A clamping plate 14 is fixed to the upper end of the sliding plate 13. The front and rear clamping plates 14 respectively fit the front and rear surfaces of the boom body 1. A ratchet 15 is fixed to the outer surface of the threaded rod 12 in front of the C-shaped plate 10. The threads of the two slide plates 13 are opposite, that is, when the threaded rod 12 is rotated, the two slide plates 13 will move synchronously relative to each other or in opposite directions; Rotating the threaded rod 12 clockwise will cause the two slide plates 13 to move relative to each other; conversely, rotating it clockwise will cause the two slide plates 13 to move in opposite directions. After the two clamping plates 14 on the left and the two clamping plates 14 on the right are respectively clamped to the outside of the two boom bodies 1, the reinforcing plate 9 is fixed together with the two boom bodies 1. When the boom assembly rotates, the reinforcing plate 9 can reduce the steering torque between two adjacent boom bodies 1, ensuring the stability of the connecting mechanism 2, avoiding the problem of loosening of the assembly nodes of the boom body 1 caused by long-term rotation operation, and ensuring the service life of the boom.

[0016] exist Figure 1 , Figure 3 and Figure 4 In the middle: The front surface of the C-shaped plate 10 is provided with an anti-loosening mechanism 16 above the threaded rod 12. The anti-loosening mechanism 16 includes a spring 17. The upper end of the spring 17 is fixedly connected to a mounting block 18, and the lower end of the spring 17 is fixedly connected to a pawl 19. The pawl 19 is attached to the ratchet 15. The end of the pawl 19 away from the threaded rod 12 is internally rotatably connected to a mounting rod 20. Both the mounting block 18 and the mounting rod 20 are fixedly connected to the front surface of the C-shaped plate 10. The pawl 19 is attached to the ratchet 15, so that the ratchet 15 can rotate clockwise normally but cannot rotate counterclockwise, thus preventing the two clamped plates 14 from coming loose. After pulling the pawl 19 away from the ratchet 15, the threaded rod 12 can be rotated counterclockwise.

[0017] The working principle of this utility model is as follows: During assembly, the adjacent boom bodies 1 are connected to the connecting sleeve 4 through the connecting block 3, and the pin 5 is inserted and the C-shaped pin 7 is inserted to complete the fixation; when installing the reinforcement mechanism 8, the C-shaped plate 10 of the reinforcement plate 9 is placed on the outside of the adjacent boom bodies 1, and the threaded rod 12 is rotated clockwise. The reverse thread drives the two side slide plates 13 to slide relative to each other along the slide rod 11, so that the clamping plate 14 clamps the front and rear surfaces of the boom body 1. At this time, the pawl 19 is pressed against the ratchet 15 under the action of the spring 17 to prevent the threaded rod 12 from rotating counterclockwise; during disassembly, the pawl 19 is pulled up to disengage from the ratchet 15, and the threaded rod 12 is rotated counterclockwise to release the clamping plate 14. After removing the reinforcement plate 9, the C-shaped pin 7 is pulled out and the pin 5 is pulled out to separate the boom body 1.

[0018] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A boom assembly for a tower crane, comprising a plurality of boom bodies (1) distributed from left to right, wherein a connecting mechanism (2) is provided between the ends of two adjacent boom bodies (1), characterized in that, A reinforcement mechanism (8) is provided between the exterior of two adjacent boom bodies (1). The reinforcement mechanism (8) includes a reinforcement plate (9). C-shaped plates (10) are fixed to both ends of the side surface of the reinforcement plate (9) near the boom body (1). Two sliding rods (11) are symmetrically fixed to the front and rear surfaces of the C-shaped plate (10). A threaded rod (12) is rotatably connected between the two sliding rods (11) on the rear surface of the C-shaped plate (10). Two sliding plates (13) are threadedly connected to the outer surface of the threaded rod (12) on the inner side of the C-shaped plate (10). A clamp (14) is fixed to the upper end of the sliding plate (13). A ratchet (15) is fixed to the outer surface of the threaded rod (12) in front of the C-shaped plate (10). An anti-loosening mechanism (16) is provided on the front surface of the C-shaped plate (10) above the threaded rod (12).

2. The boom assembly of a tower crane according to claim 1, characterized in that, The connecting mechanism (2) includes a connecting block (3) and a connecting sleeve (4) located outside the connecting block (3). The connecting block (3) and the connecting sleeve (4) are connected by a pin (5) through the interior. The pin (5) is connected to a bushing (6) in front of the connecting sleeve (4) through the exterior. The bushing (6) is connected to a C-shaped pin (7) through the interior.

3. The boom assembly of a tower crane according to claim 1, characterized in that, The anti-loosening mechanism (16) includes a spring (17), the upper end of which is fixedly connected to a mounting block (18), and the lower end of which is fixedly connected to a pawl (19). The end of the pawl (19) away from the threaded rod (12) is internally rotatably connected to a mounting rod (20).

4. The boom assembly of a tower crane according to claim 1, characterized in that, The threaded rod (12) moves through the front surface of the C-shaped plate (10), the slide rod (11) moves through the slide plate (13), and the front and rear clamps (14) respectively fit the front and rear sides of the boom body (1).

5. The boom assembly of a tower crane according to claim 2, characterized in that, The connecting block (3) is fixed to the right end of the left boom body (1), the connecting sleeve (4) is fixed to the left end of the right boom body (1), and the C-shaped pin (7) moves through the front end of the pin shaft (5).

6. The boom assembly of a tower crane according to claim 3, characterized in that, The pawl (19) is attached to the ratchet (15), and the mounting block (18) and mounting rod (20) are both fixed to the front surface of the C-shaped plate (10).

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